Ventilatory control during exercise in children with mild or moderate asthma

Medicine and Science in Sports and Exercise
M RamonatxoC Préfaut

Abstract

The aim of this study was to specify whether during exercise the neural response to increased resistive load in asthmatic children corresponds to a modification of the neuromuscular inspiratory drive, to a modification of the breathing pattern, or to both. Thus, nine children with mild or moderate asthma (aged 10-15 yr) and nine normal children (aged 11-16 yr) were studied during an incremental load exercise with a cyclic ergometer, the load of which was increased by steps of 30 W.3 min-1. During the 3rd min of each workload, we measured the following parameters: O2 consumption (VO2), CO2 production (VCO2), ventilation (VE), tidal volume (VT), respiratory frequency (f), ratio of inspiratory to total time of respiratory cycle (T1/TTOT), mean inspiratory flow (VT/T1) as well as mouth occlusion pressure measured at 100 ms (P0.1), and inspiratory power for breathing (W). At maximum level, the two groups showed identical values for heart rate, ventilation divided by weight (VEBW), T1/TTOT), VT/T1, P0.1, and W. However, asthmatic children had lower maximal power (P less than 0.02), higher tidal volume divided by weight (VTBW) (P less than 0.05), and lower f (P less than 0.01). At a same level of exercise (60, 90, or 120 W), in both g...Continue Reading

Associated Clinical Trials

Citations

Nov 19, 2014·The Journal of Asthma : Official Journal of the Association for the Care of Asthma·Arturo Cortés-TéllesJordan A Guenette
Apr 21, 2007·Archives de pédiatrie : organe officiel de la Sociéte française de pédiatrie·C Karila
May 16, 2006·Archives de pédiatrie : organe officiel de la Sociéte française de pédiatrie·F-P Counil, M Voisin
Mar 1, 1992·The Physician and Sportsmedicine·H Gong
Feb 5, 2011·Journal of Strength and Conditioning Research·Erwan LeclairSerge Berthoin
Jan 1, 1992·The Journal of Asthma : Official Journal of the Association for the Care of Asthma·A Varray, C Préfaut

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